RFC8410 (in)compatibility

Anders Rundgren anders.rundgren.net at gmail.com
Fri Aug 28 14:07:46 UTC 2020


On 2020-08-28 15:58, Weijun Wang wrote:
> Is “Ed25519” what you need? It’s not available in JDK 11. See https://bugs.openjdk.java.net/browse/JDK-8199231.

I know, that's why I wrote that I currently use BC (BouncyCastle).

My question is thus applicable to JDK 15.  BC apparently rejects X25519 signature keys.  Probably for a reason.

Regards,
Anders

> 
> —Max
> 
>> On Aug 28, 2020, at 9:55 AM, Anders Rundgren <anders.rundgren.net at gmail.com> wrote:
>>
>> On 2020-08-28 15:41, Weijun Wang wrote:
>>> What version of java are you using and what’s your command to generate the key pair?
>>
>> Hi Max,
>>
>> While waiting for JDK 15, I'm currently using JDK11 and BC but the question is really about the Signature object specification.
>>
>>   KeyPairGenerator kpg = KeyPairGenerator.getInstance("X25519")
>>   KeyPair kp = kpg.generateKeyPair();
>>
>> A self-signed X25519 certificate would require that a X25519 key is useful as a signature key.
>>
>> Note: I'm not proposing such a feature, I'm just trying to understand :)
>>
>> Regards,
>> Anders
>>> Thanks,
>>> Max
>>>> On Aug 28, 2020, at 7:03 AM, Anders Rundgren <anders.rundgren.net at gmail.com> wrote:
>>>>
>>>> Hi Crypto Experts,
>>>>
>>>> Please pardon my ignorance regarding curve25519, but I ran into problems [*] trying to recreate the sample certificate:
>>>> https://urldefense.com/v3/__https://tools.ietf.org/html/rfc8410*section-10.2__;Iw!!GqivPVa7Brio!OMTnVBdbrt8MuV8YwHsti8iuWLk2QE3C6FGAQeBoMJj9pIBQiRO6cbcSLzY8F_90TQ$
>>>> It seems that the certificate is signed with a key intended for ECDH.
>>>> Question: is Java's "Signature" object supposed to accept X25519 keys?
>>>>
>>>> Personally I don't see any use of a self-signed encryption certificate so maybe this is just a bad example...kind of edge case.
>>>>
>>>> Regards,
>>>> Anders Rundgren
>>>>
>>>> *] java.security.InvalidKeyException: cannot identify EdDSA private key
>>
> 



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